Subject: avoid SPU_ACTIVATE_NOWAKE optimization

From: Christoph Hellwig <hch@lst.de>
This optimization is still buggy, so back it out for now.

Signed-off-by: Arnd Bergmann <arnd.bergmann@de.ibm.com>

Index: linux-2.6/arch/powerpc/platforms/cell/spufs/run.c
===================================================================
--- linux-2.6.orig/arch/powerpc/platforms/cell/spufs/run.c
+++ linux-2.6/arch/powerpc/platforms/cell/spufs/run.c
@@ -143,7 +143,7 @@ static inline int spu_run_init(struct sp
 	int ret;
 	unsigned long runcntl = SPU_RUNCNTL_RUNNABLE;
 
-	ret = spu_acquire_runnable(ctx, SPU_ACTIVATE_NOWAKE);
+	ret = spu_acquire_runnable(ctx, 0);
 	if (ret)
 		return ret;
 
@@ -155,7 +155,7 @@ static inline int spu_run_init(struct sp
 			spu_release(ctx);
 			ret = spu_setup_isolated(ctx);
 			if (!ret)
-				ret = spu_acquire_runnable(ctx, SPU_ACTIVATE_NOWAKE);
+				ret = spu_acquire_runnable(ctx, 0);
 		}
 
 		/* if userspace has set the runcntrl register (eg, to issue an
Index: linux-2.6/arch/powerpc/platforms/cell/spufs/sched.c
===================================================================
--- linux-2.6.orig/arch/powerpc/platforms/cell/spufs/sched.c
+++ linux-2.6/arch/powerpc/platforms/cell/spufs/sched.c
@@ -263,7 +263,6 @@ static void spu_prio_wait(struct spu_con
 {
 	DEFINE_WAIT(wait);
 
-	set_bit(SPU_SCHED_WAKE, &ctx->sched_flags);
 	prepare_to_wait_exclusive(&ctx->stop_wq, &wait, TASK_INTERRUPTIBLE);
 	if (!signal_pending(current)) {
 		mutex_unlock(&ctx->state_mutex);
@@ -272,7 +271,6 @@ static void spu_prio_wait(struct spu_con
 	}
 	__set_current_state(TASK_RUNNING);
 	remove_wait_queue(&ctx->stop_wq, &wait);
-	clear_bit(SPU_SCHED_WAKE, &ctx->sched_flags);
 }
 
 /**
@@ -292,7 +290,7 @@ static void spu_reschedule(struct spu *s
 	best = sched_find_first_bit(spu_prio->bitmap);
 	if (best < MAX_PRIO) {
 		struct spu_context *ctx = spu_grab_context(best);
-		if (ctx && test_bit(SPU_SCHED_WAKE, &ctx->sched_flags))
+		if (ctx)
 			wake_up(&ctx->stop_wq);
 	}
 	spin_unlock(&spu_prio->runq_lock);
@@ -414,8 +412,7 @@ int spu_activate(struct spu_context *ctx
 		}
 
 		spu_add_to_rq(ctx);
-		if (!(flags & SPU_ACTIVATE_NOWAKE))
-			spu_prio_wait(ctx);
+		spu_prio_wait(ctx);
 		spu_del_from_rq(ctx);
 	} while (!signal_pending(current));
 
Index: linux-2.6/arch/powerpc/platforms/cell/spufs/spufs.h
===================================================================
--- linux-2.6.orig/arch/powerpc/platforms/cell/spufs/spufs.h
+++ linux-2.6/arch/powerpc/platforms/cell/spufs/spufs.h
@@ -41,7 +41,7 @@ struct spu_gang;
 
 /* ctx->sched_flags */
 enum {
-	SPU_SCHED_WAKE = 0,
+	SPU_SCHED_WAKE = 0, /* currently unused */
 };
 
 struct spu_context {
@@ -191,9 +191,7 @@ void spu_forget(struct spu_context *ctx)
 int spu_acquire_runnable(struct spu_context *ctx, unsigned long flags);
 void spu_acquire_saved(struct spu_context *ctx);
 int spu_acquire_exclusive(struct spu_context *ctx);
-enum {
-	SPU_ACTIVATE_NOWAKE = 1,
-};
+
 int spu_activate(struct spu_context *ctx, unsigned long flags);
 void spu_deactivate(struct spu_context *ctx);
 void spu_yield(struct spu_context *ctx);